


<div class="input-group mb-3">
  <div class="input-group-prepend">
    <span class="input-group-text" id="basic-addon3">图片</span>
  </div>
  <input type="file" (change)="onFileChanged($event)">
</div>



<button class="btn btn-primary" (click)="save()">保存</button>

